Tinkering with Growth Plates

Rolian, Campbell

doi:10.1002/9781118524756.ch7

Cited by 7 publications

(1 citation statement)

References 40 publications

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“…In this study, I revisit and extend this hypothesis using a complementary approach based on viability selection modeling (Bürger & Lynch, 1995;Jones et al, 2003;Jones et al, 2004Jones et al, , 2007Rolian, 2016;Rolian, 2020;Salazar-Ciudad & Marin-Riera, 2013;Villmoare, 2013). In viability selection modeling, phenotypic evolution is simulated over time based on the probability of individuals in one generation surviving and contributing to the next generation.…”

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Re‐evaluating the correlated evolution of human hands and feet using viability selection modeling

Rolian

2023

American Journal of Biological Anthropology

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ObjectivesBipedalism and enhanced manipulative abilities are defining features of the hominin lineage, associated with derived foot and hand skeletal morphology, respectively. These unique morphologies are traditionally thought to have evolved independently, but previous work suggests that some aspects of hand and foot skeletal morphology coevolved, due to strong phenotypic correlations among serially homologous elements.Materials and MethodsHere, I further tested this hypothesis using viability selection modeling, which simulates phenotypic evolution based on the likelihood of individual survival, determined using individuals' distance to a predetermined adaptive peak, in this case modern Homo. Using chimpanzees (Pan) as a proxy for hominin ancestral hand and foot morphology, I quantified morphological changes in the hand when only homologous foot elements were targets of selection, as well as the reverse scenario in which only hand morphology influences viability.ResultsSimulation results show that in both scenarios, one autopod evolves as correlated response to selection acting on the other. Importantly, however, simulation outcomes show that the adaptive evolution of the uniquely derived human foot can indirectly produce Homo‐like manual proportions, but the reverse is not true: adaptive evolution of an African ape‐like hand is not sufficient to produce a Homo‐like human foot.DiscussionThese simulations thus lend further empirical support to the hypothesis that human hands and feet coevolved, and indicate that selection acting on the foot may have produced derived hand morphology that facilitated the evolution of enhanced manipulative behaviors.

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Re‐evaluating the correlated evolution of human hands and feet using viability selection modeling

Rolian

2023

American Journal of Biological Anthropology

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The befuddling nature of mouse lemur hands and feet at Bezà Mahafaly, SW Madagascar

Agostini

Rasoazanabary

Godfrey

2017

American J Primatol

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The reddish-gray mouse lemur (Microcebus griseorufus) possesses striking phenotypic and behavioral variation. This project investigates differences in autopod proportions in neighboring populations of M. griseorufus from the Special Reserve at Bezà Mahafaly in southwest Madagascar. One population resides in an environment generally preferred by M. griseorufus-a spiny forest with large-trunked trees, vertically-oriented supports, and more open ground, while the other resides in a gallery forest with abundant small, often horizontal peripheral branches in high canopy. We demonstrate significant interpopulation differences in autopod morphophology despite no evidence of divergence in mitochondrial cytochrome b. We test two hypotheses regarding ultimate causation. The first, based on the Fine Branch Arborealism Hypothesis (FBAH), holds that autopod differences are related to different locomotor practices in the two environments, and the second, based on the Narrow Niche Hypothesis (NNH), holds that the observed differences reflect a relaxation (from ancestral to descendant conditions) of selective pressure for terrestrial locomotion and/or use of large, vertical supports combined with positive selection for locomoting in peripheral branch settings. Our data conform well to FBAH expectations and show some support for the NNH. Individuals from the gallery forest possess disproportionally long posterior digits that facilitate locomotion on small, flexible canopy supports while individuals from the spiny forest possess shorter posterior digits and a longer pollex/hallux that increase functional grasping diameter for large vertical supports and facilitate efficient ground locomotion. Focal individual data confirm differences in how often individuals descend to the ground and use vertical supports. We further show that predispersal juveniles, like adults, possess autopod morphologies suited to their natal forest. We explore two proximate mechanisms that could generate these cheiridial differences. The first posits an in vivo plastic response to different locomotor behaviors, the second posits differences that manifest in early development.

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Timing the developmental origins of mammalian limb diversity

Sears

Maier

Sadier

et al. 2017

Genesis

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Mammals have highly diverse limbs that have contributed to their occupation of almost every niche. Researchers have long been investigating the development of these diverse limbs, with the goals of identifying developmental processes and potential biases that shape mammalian limb diversity. To date, researchers have used techniques ranging from the genomic to the anatomic to investigate the developmental processes shaping the limb morphology of mammals from five orders (Marsupialia, Chiroptera, Rodentia, Cetartiodactyla, and Perissodactyla). Results of these studies suggest that the differential expression of genes controlling diverse cellular processes underlies mammalian limb diversity. Results also suggest that the earliest development of the limb tends to be conserved among mammalian species, while later limb development tends to be more variable. This research has established the mammalian limb as a model system for evolutionary developmental biology, and set the stage for more in-depth, cross-disciplinary research into the genetic controls, tissue-level cellular behaviors, and selective pressures that have driven the developmental evolution of mammalian limbs. Ideally, these studies will be performed in a diverse suite of mammalian species within a comparative, phylogenetic framework.

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Tinkering with Growth Plates

Cited by 7 publications

References 40 publications

Re‐evaluating the correlated evolution of human hands and feet using viability selection modeling

Re‐evaluating the correlated evolution of human hands and feet using viability selection modeling

The befuddling nature of mouse lemur hands and feet at Bezà Mahafaly, SW Madagascar

Timing the developmental origins of mammalian limb diversity

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